US2464427A - Double-action mechanism for pistols - Google Patents

Double-action mechanism for pistols Download PDF

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US2464427A
US2464427A US65A US6548A US2464427A US 2464427 A US2464427 A US 2464427A US 65 A US65 A US 65A US 6548 A US6548 A US 6548A US 2464427 A US2464427 A US 2464427A
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sear
hammer
trigger
member
abutment
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George A Wilson
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HIGH STANDARD Manufacturing CORP
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HIGH STANDARD Manufacturing CORP
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/42Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/43Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • F41A19/47Cocking mechanisms
    • F41A19/48Double-action mechanisms, i.e. the cocking being effected during the first part of the trigger pull movement

Description

March 15, 1949. w so 2,464,427

DOUBLE-ACTION MECHANISM FOR PISTOLS Filed Jan. 2, 1948 3 Sheets-Sheet 1 Arkornegs March 15, 1 49. G. A'. WILSON 2,464,427

DOUBLE-ACTION MECHANISM FOR PISTOLS Filed Jan. 2, 1948 3 Sheets-Sheet March 15, 1949. w so DOUBLE-ACTION MECHANISM FOR PISTOLS 3 Sheets-Sheet 5 Filed Jan. 2, 1948 Attorneys Fatented Mar. 15, 1949 DOUBLE-ACTH? MECHANISM FOR PISTOLS necticut Appiication January 2, 1948, Serial No. 65

5 Claims.

The present invention relates in general to firearms and more particularly to improvements in automatic pistols of the so-called blow-back type. wherein the breechblock is moved rearwardly relative to the barrel by gas pressure developed in the barrel and acting against the front face of the breechblock on discharge of a cartridge, the rearward excursion of the breechblock being utilized to extract the spent cartridge from the chamber of the barrel.

An object of the present invention is to provide a superior automatic blow-back type of pistol characterized by a double-action mechanism of economical and durable construction.

A further object of the invention is to provide an automatic blow-back type of pistol with a superior double-action mechanism embodying easily fabricated parts assembled in cooperative relationship with the fire-control mechanism of the pistol, so as to provide a direct and positive connection between the hammer and trigger.

A still further object of the invention is to provide an automatic blow-back type of pistol with superior double-action mechanism which renders the primary sear inoperative and itself performs the function of cooking and releasing the hammer on retraction of the trigger for firing the first round of ammunition.

With the above and other objects in view, as will appear to those skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art.

In the accompanying drawings, in which certain modes of carrying out the present invention are shown for illustrative purposes:

Fig. l is a side elevation of a pistol embodying the double-action mechanism of this invention;

Fig. 2 is an enlarged fragmentary side elevation with the cover-plate of the double-action mechanism removed and the hammer in its firing position;

Fig. 3 is similar to Fig. 2 but with the hammer held in cocked position by means of the doubleaction mechanism;

Fig. 4 is similar to Fig. 2 but with the hammer moved into cocking engagement with the primary sear by the action of the rearwardly moving breechblock;

Fig. 5 is similar to Fig. 4 but with the breechblock returned to its chamber-closing position and the trigger released;

Fig. 6 is an end elevation on section line 6-6 of Fig. 2;

Fig. '7 is an end elevation on section line 1-1 of Fig.

Fig. 8 is a perspective view of the hammer;

Fig. 9 is a perspective view of the sear;

Fig. 10 is a perspective view of the trigger; and

Fig. 11 is a perspective View of the actuator and secondary sear-member of the double-action mechanism.

Referring to the drawings, the latter show an exemplary embodiment of the invention designed for operation in an automatic blow-back type of pistol which comprises, in the main, a frame 15 having a forward portion I6 on which the barrel ll of the pistol is secured; and a rearward portion l8 provided with an integral downwardlyprojecting hollow pistol-grip [9 arranged to receive a box-magazine, said rearward portion having longitudinal guide-grooves Z! in its opposite substantially-vertical sides 22 in which the breechblock 23 of the pistol is slidably supported for movement longitudinally relative to the fixed barrel. Intersecting the rear end of the rearward portion of the frame, is a vertical slot 24 which is adapted to accommodate the pivoted hammer 25 and primary sear 26 of the fire-control mech-= anism. Referring especially to Fig. 3, the breechblock has a longitudinal axial aperture 2'! in which the firing-pin 28 is slidably mounted, the latter being urged normally rearwardly in the aperture 21 by a coil-spring 29 mounted on the forward end of the firing-pin and arranged normally to hold its cartridge-striking end 30 rearwardly of the front face of the breechblock and its hammer-engaging end 34 rearwardly of the rear end of the breechblock. The action-spring 32 of the piston illustrated herein is mounted in a longitudinal aperture 33 of the breechblock between a fixed abutment 3 3 in the forward end of the aperture 33, and one of a pair of fixed abutments 35 projecting upwardly from the rear end of the frame, the action-spring 32 being adapted thus to retard the rearward recoil of the breechblock following the discharge of the pistol and thereafter to force the breechblock forwardly into breech-closing position. During the rearward excursion of the breechblock, its rear end is adapted to engage the front face 36 of the hammer 25 above its transverse pivot-pin 37 to pivot the hammer rearwardly or clockwise, as seen in Fig. 4, against the resisting force of a conventional hammer-spring-and-link assembly into cooking engagement with the primary sear 26 of the pistol. The latter is pivoted as at 38 in the vertical slot 24 of the frame, forwardly of the hammer, its sear-nose 39 being urged into engagement with either of two sear-notches 4i! and 4! of the hammer by the force of a conventional searspring-and-pilot assembly so as to hold the hammer in its halfor full-cocked positions, respectively. Thus, the hammer is cooked automatically with the firing of each shot and the subsequent rearward excursion of the breech block. In order to cook the hammer manually, the latter is provided with a knurled thumb-piece 42 by which the shooter may pull the hammer down manually to either its halfor full-cocked position.

Referring especially to Fig. 9, the sear has, in addition to its usual sear-nose 354, an integral shoulder 43 which projects laterally from and at substantially right angles to the vertical lefthand face of the sear, the shoulder being formed forwardly of the transverse pivot-pin 38 of the sear and sloped upwardl and forwardlyat an angle of substantially 9 to a line perpendicular to the top edge thereof. The upper end of the sear-shoulder 43 intersects the top edge of the sear, while the lower end of the shoulder is squared off at a point approximately intermediate the top edge of the sear and the center of the sear-pin. This sear-shoulder 43 constitutes an element of the improved double action mechanism of this invention, additional elements of which are described below.

Referring now to Figs. 2, 3 and 10, the trigger of the pistol is shown at 44 and is pivotally mounted on a transverse pivot-pin 45 in a vertical recess 46 in the forward part of the frame. The finger-piece 41 of the trigger projects downwardly into the trigger-guard 48 of the frame and is resiliently held forwardly in the triggerguard by the force of a trigger-spring-and-pilot assembly acting against the upper end as of the trigger above its pivot-pin 45 to pivot the trigger clockwise, as seen in Fig. 2.

The double-action mechanism is adapted to connect the trigger to the hammer of the pistol so that the first shot may be fired simply by pulling the trigger, the rearward draft on the trigger serving both to cook the hammer and thereafter to release the latter against the firingpin. The double-action mechanism serves also in the normal operation of the pistol, that is to say, when the hammer is cocked by the primary sear, to disengage the latter therefrom and fire the pistol. The double-action mechanism is mounted, preferably, in one of the vertical sides 22 of the pistol-frame and to this end, the lefthand side of the latter is provided with a longitudinal relatively-shallow recess 59, the over-all length of which is slightly greater than the distance between the pivot-pins of the trigger and hammer, respectively. As shown, the opposite ends of the recess 50 are preferably arcuate and the upper and lower sides and 52 respectively of the recess are substantiall parallel, the lower side extending longitudinally of the rear endportion of the frame immediately above the juncture of the upper end of the pistol-grip l9 therewith; and the upper side 5i extending parallel to and immediately below the corresponding guide-groove 2| of the frame, being separated therefrom by a longitudinal rib 53. Formed in the bottom of the shallow recess 50 is a longitudinal groove 54 which extends from the forward end of the recess rearwardly and upwardly at a relatively slight angle to a point substantially intermediate the opposite ends of the recess, at which point the longitudinal groove 54 intersects a cutout 55 in the bottom of the recess 50, this cutout being substantially equal in depth to that of the groove 54 and extending substantial y to the rear end of the recess.

The forward edge of the bottom half of the cutout forms a ledge 56 with the lower edge of the recess 59, while the top edge of the cutout immediately rearwardly of the rear end of the longitudinal groove 54 is extended upwardly to intersect the longitudinal guide-groove 2! of the frame, the intersecting portion of the cutout being elongated and hereinafter referred to as the clearance-recess 51. The top edge of the cutout also intersects the separating-rib 53 rearwardly of the clearance-recess 51 to form an elongated clearance-slot 53, which constitutes the upper edge of an elongated aperture 59. The latter extends inwardly transversely to intersect the vertical hammer-and-sear recess 24 at the rear end of the frame substantially opposite the shoulder 43 of the sear to provide access thereto from the cutout 55. Between the forward end of the clearance-slot 58 and the clearancerecess 51 is a relatively-short length of the separating-rib 53, the bottom rear corner of which constitutes a. cam-engaging surface 60 for the purpose hereinafter described; Formed in the forward end of the longitudinal groove 54 is an elongated aperture El which extends transversely of the frame and is adapted to intersect the upper end of its vertical trigger-recess 46 to provide access to the upper end of the trigger from the groove in the left-hand side of the frame. As shown especially well in Fig. 10, a shouldered trigger-pin 52 is secured to the upper end of the trigger substantially opposite the elongated aperture 6! so as to extend outwardly transversely therethrough into the longitudinal groove 54 of the frame. A second elongated aperture 63 is provided in the cutout 55 adjacent the rear end thereof and directly beneath the pivot-pin 37 of the hammer, this aperture '63 extending transversely into the vertical hammerand-sear slot 24 of the frame to provide access to the hammer from the cutout in the left-hand side of the frame. As shown especially well in Fig. 8, a pin 64 is carried on the hammer below and slightly 'to the rear of its pivot-pin 31, and is adapted to extend outwardly transversely through the elongated aperture 63 into the rear end of the cutout 55. Referring especially to Figs. 2, 5 and 11, the d0uble-action mechanism comprises, in the main, a link-member 65 which is slidably mounted in the longitudinal groove 54 and is pivotally connected at its forward end to the outer end of the shouldered trigger-pin 62 which extends outwardly through the elongated aperture (il in the forward end of the groove 54 The width of the link-member is somewhat less than the width of the longitudinal groove 54 so as to permit the link-member to move freely upwardly and forwardly therein on retraction of the finger-piece of the trigger. The rear end of the link-member is normally at substantially the rear end of the cutout and is characterized by a longitudinally-elongated notch 66 in its upper edge, the rear wall of which constitutes a radius curving upwardly and forwardly, the lower portion thereof constituting a cocking-abutment 51 and the upper portion thereof comprising a secondary sear-shoulder 68, for the purpose hereinafter described.

The forward wall of the notch 68 constitutes a substantially-vertical rearwardly-facing shoulder 69 hereinafter referred to as a thrust abutment against which the transversely-projecting pin'of the hammer is adapted to engage for thrusting the link-member forwardly in its groove 54, as the hammer is pivoted rearwardly into its halfcocked or full-cocked positions. When the hammer is in its normal uncooked position, the thrust abutment 69 is held against the transverse pin 64 of the hammer by the force of the triggerspring acting normally to thrust the link-member rearwardly. The elongated notch 65 of the link-member is adapted to be held up normally in cooperative relationship with the transverse pin 64 of the hammer by the force of a resilientmember comprising a leaf-spring frictionally secured at its rear end in a slot in the underside andadjacent the rear end of the link-member; and 'slidably engageable at its forward end with the stepped ledge 56 of the cutout. Formed integrally on the upper edge of the link-member and immediately opposite the clearance-recess 51 of the cutout 55 is a disconnector-means H comprising an upwardly-projecting lug rounded over on its opposite ends and adapted to project upwardly and outwardly into the guidegroove 2| of the frame and to move longitudinally freely in the elongated clearance-recess 5'5 of the cutout 55. The portion of the link-member between its disconnector-means H and its elongated notch 65 slopes downwardly and rearwardly and is provided on its upper edge with an integral upwardly-projecting flange-portion E2, the forward edge of which comprises an upwardly-and-rearwardly-sloping cam-surface 13 arranged normally beneath and rearwardly of the cam-engaging surface 69 of the separating-rib 53 and adapted to cooperatively engage therewith in the manner and for the purpose hereinafter described. Rearwardly of the cam-surface 13 of the flange '52, the latter is provided with an integral lip-portion Hi which is arranged to extend inwardly freely into the elongated transverse aperture 59 of the cutout, the forward edge of the lip it sloping rearwardly and having a substantially-rectangular tongue-portion 15 at its inner end, the forward edge 16 of which is located normally rearwardly of the shoulder 43 of the sear and is adapted to engage the latter and'move it out of operative engagement with the hammer as hereinafter described, the forward edge 16 of the tongue being hereinafter referred to as a primary sear-abutment. The recess 50 of the frame is adapted to accommodate a cover H (see Fig. l) which not only protects the operating parts of the double-action mechanism from dirt, moisture, and the like, but also serves tohold the linkmember of the double-action mechanism in as sembled position on the respective pins of the trigger and hammer, the cover being fixedly secured in the recess 50 in any suitable manner.

The operation of the double-action mechanism may be described briefly as follows:

On retracting the finger-piece M of the trigger, the link-member 55 is pulled forwardly in its groove 54 and cutout 55 of the frame, thereby bringing the cocking-abutment 6'! of the elongated notch 66 at the rear end of the link-member into engagement with the back side of the transversely extending hammer-pin 64. Continued rearward movement of the finger-piece 41 of the trigger pulls the hammer-pin forwardly,

thereby pivoting the hammer clockwise about its transverse pivot-pin 3? against the resisting force of the hammer-spring and advancing the cam-surface 13 of the link-member into juxtaposition to the cam-engaging surface 68 of the separating-rib 53. On continuing the forward movement of the link-member, the primary sear abutment l6 thereof engages the shoulder 43 of the primary sear and pivots the latter counterclockwise, thereby withdrawing its sear-nose 39 out of cooperative relationship with the searnotches of the hammer. Further rearward movement of the trigger and the consequent forward movement of the link-member then brings the cam-surface E3 of the link-member into engagement with the cam-engaging surface 66 of the separating-rib of the frame, whereupon the rear end of the link-member is depressed against the restraining force of the leaf-spring 10. With the depression of the rear end of the link-member, its cocking-abutment 61 is withdrawn from engagement with the back side of the transverse pin M of the hammer, the secondary sear-shoulder 68 of the notch initially engaging and almost immediately thereafter disengaging the hammerpin 64, thereby releasing the hammer which has been pivoted nearly into its full-cocked position. The compressed hammer-spring thereupon swings the hammer forwardly forcefully against the rear end of the firing-pin to discharge a cartridge in the chamber of the barrel. Immediately on discharge of the cartridge, the breechblock 23 begins to recede from the fixed barrel sliding rearwardly in the guide-grooves 2! of the frame. As the breechblock begins its rearward excursion, a clearance-recess is provided in the left-hand side thereof for accommodating the disconnectorlug H of the link-member, is displaced rearwardly relative to the disconnector-lug ii, the forward edge of the clearance-recess l9 cammingly engaging the rounded front edge of the lug H, thereby forcing the latter downwardly, whereupon the primary sear-abutment iii of the linkmember is withdrawn from engagement with the shoulder (13 of the primary sear so as to release the latter and permit it to return into cooperative relationship with the hammer. Consequently, as the latter is forced back automatically into its cocked position by the rearwardly-moving breechblock, the primary sear will initially ride over and subsequently engage the sear-notch M of the hammer to hold the latter in its full-cocked position, following the return of the breechblock to its forward breech-closing position. With the movement of the sear into the position for cocking engagement with the hammer, the lower end of the sear-shoulder 43 of the primary sear 26 rides over the tongue it of the depressed link-member to hold the rear end of the latter down, as a consequence of which it is impossible to disengage the sear from the hammer without first releasing the trigger so as to permit the link-member and more particularly its tongue to move rearwardly out from beneath the lower end of the sear-shoulder. On releasing the trigger, the force of the triggerspring thrusts the link-member rearwardly and simultaneously the leaf-spring urges the rear end of the link-member upwardly, whereby the tongue E5 of the link-member moyes rearwardly and upwardly from beneath the lower end of the searshoulder 43 to position-thexprimary sear-abutment #6 in juxtapositiontdthe rear face thereof. It will be appreciated thati nasmuch as the leafspring of the link-member urges the rear end thereof upwardly, the thrust-abutment of its elongated notch engages against the transverse pin of the hammer, and that since the latter is in its full-cocked position, its pin is in its foremost position in its aperture 63, whereby the link-member is held forwardly of its normal rearmost position, that is to say, the trigger remains in a partially-retracted position (see Fig. in which the primary sear-abutment T6 of the tongue is immediately rearwardly of the shoulder of the primary sear. Consequently, a relatively-short rearward pull on the finger-piece of the trigger will move the primary sear-abutment 16 of the link-member forwardly into engagement with the primary sear and disengage the latter from the sear-shoulder M of the hammer to permit it to swing forwardly for firing the next-succeeding shot. After the final shot has been fired and the trigger pulled once more to release the hammer from its cocked position, the latter returns to firing position wherein its transverse pin 64 is at its rearmost position in its aperture 63, and hence on releasing the trigger, the linkmember and more particularly the thrust-abutment 69 of its elongated notch, moves rearwardly in the cutout to its original rearmost position therein, the leaf-spring of the link-member elevating the rear end of the link upwardly so as to engage the cocking-abutment 67 of the elongated notch with the rear face of the hammer-pin t t.

The arm is thus readied for firing the first round of a new magazine on retracting the trigger.

As pointed out above, the double action mech- 'anis'm comprises essentially a single link-member which functions as an actuator of the hammer and primary sear of the firearm and also as a secondary sear to release the hammer. Moreover, the double-action mechanism embodies a disconnector operable by the relative movement of the breechclock to prevent doubling, the link-member of the double-action mechanism being characterized by its simplicity of construction and operation, the entire assembly being retained within the groove in the, side of the frame and effectively concealed and retained in operative relationship therein by the cover-member fitting into the recess in the side of the frame.

The invention may be carried out in other specific ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim: 1. An automatic pistol of the blow-back type,

including in combination: a frame; fire-control mechanism including a trigger mounted in the forward part of said frame, a hammer mounted in the rear part thereof, and a primarysear having a sear-shoulder; and double-action mechanism to connect said trigger and said hammer, said mechanism comprising an actuator-andsecondary-sear-member arranged to be moved forwardly by retraction of said trigger and having a cocking-abutment adjacent its rear end and a'thrust-abutment forwardly thereof, cocking-abutment being arranged normally toengage said hammer and sequentially to cock said hammer and then to disengage the latter as a result of the forward movement of said actuator-andsecondary-sear-member by retraction of said trigger, a spring carried by said actuator-andsecondary-sear-member and arranged to cooperatively engage said frame to urge said cockingabutment into re-engagement with said hammer on release of said trigger, a primary abutment arranged to be actuated by the forward movement of said actuator-and-secondary-sear-member to engage said sear-shoulder and disable said primary sear prior to the release of said hammer, and a disconnector operable on release of said hammer and the subsequent discharge of said pistol to positively withdraw said primary searabutment from disabling engagement with the sear-shoulder of said primary sear so as to permit said primary sear to cook said hammer, said aotuator-and-secondary-sear-member being arranged also to be moved forwardly by engagement of said hammer with the thrust-abutment thereof when said hammer is moved into cocked engagement with said primary sear to position said primary sear-abutment in cooperative relationship with said sear-shoulder, thereby to disengage said primary sear from said hammer on retraction of said trigger.

2. An automatic pistol of the blow-back type, including in combination: a frame having a camsurface; fire-control mechanism including a trigger mounted in the forward part of said frame, a hammer mounted in the rear part thereof, and a primary sear; and double-action mechanism to connect said trigger and said hammer, said mechanism comprising an actuator-and-secondarysear-member arranged to be moved forwardly by retraction of said trigger and having a cam-surface arranged to cooperatively engage with the cam-surface of said frame during the forward movement of said actuator-and-secondary-searmember to depress the rear end thereof, a cock ing-abutment at the rear end of said actuatorand-secondary-sear-member and a thrust-abutment forwardly thereof, said cocking-abutment being arranged normally to engage said hammer and sequentially to cook said hammer as a result of the forward movement of said actuator-andsecondary-sear-member by retraction of said trigger and thereafter to disengage said hammer as a result of the depression of the rear end of said actuator-and-secondary-sear-member, and a primary sear-abutment arranged to be actuated by the forward movement of said actuator-andsecondary-sear-member to engage and disable said primary sear prior to the release of said hammer, said actuator-and-secondary-sear-member being arranged also to be moved forwardly by engagement of said hammer with the thrust-abutment thereof when said hammer is moved into cocked engagement with said primary sear to position said primary sear-abutment in cooperative relationship thereto, thereby to disengage said primary sear from said hammer on retraction of said trigger.

3. An automatic pistol of the blow-back type, including in combination: a frame having a camsurface; fire-control mechanism including a trigger mounted in the forward part of said frame, a hammer mounted in the rear part thereof, and a primary sear; and double-action mechanism to connect said trigger and said hammer, said mechanism comprising an actuator-andsecondary-sear-member arranged to be moved forwardly by retraction of said trigger and having a cam-surface arranged to cooperatively engage with the cam-surface of said frame during the forward movement of said actuator-and-secondary-sear-member to depress the rear end thereof, a cocking-abutment at the rear end of saidactuator-and-secondary-sear-member and a. thrust-abutment forwardly thereof, said cockingabutment being arranged normally to engage said hammer and sequentially to cook said hammer as a result of the forward movement of said actuator-and-secondary-sear-member by retraction of said trigger and thereafter to disengage said hammer as a result of the depression of the rear end of said actuator-and-secondary-searmember, a leaf-spring secured at its rear end to said actuator-and-secondary-sear-member and slidably engaged at its forward end with said frame to urge said cocking-abutment into reengagement with said hammer on release of said trigger, and a primary sear-abutment arranged to be actuated by the forward movement of said actuator-and-secondary-sear-member to engage and disable said primary sear prior to the release of said hammer, said actuator-and-secondarysear-member being arranged also to be moved forwardly by engagement of said hammer with the thrust-abutment thereof when said hammer is moved into cocked engagement with said primary sear to position said primary sear-abutment in cooperative relationship thereto, thereby to disengage said primary sear from said hammer on retraction of said trigger.

4. An automatic pistol of the blow-back type, including in combination: a frame having a camsurface; a breechblock reciprocably mounted on said frame; fire-control mechanism including a trigger mounted in the forward part of said frame, a hammer mounted in the rear part thereof, and a primary sear; and double-action mechanism to connect said trigger and said hammer, said mechanism comprising an actuator-andsecondary-sear-member arranged to be moved forwardly by retraction of said trigger and having a cam-surface arranged to be moved into cooperative engagement with the cam-surface of said frame during the forward movement of said actuator-and-secondary-sear-member to depress the rear end thereof, a cocking-abutment at the rear end of said actuator-and-secondary-searmember and a thrust-abutment forwardly thereof, said cocking-abutment being arranged normally to engage said hammer and sequentially to cook said hammer as a result of the forward movement of said actuator-and-secondary-searmember by retraction of said trigger and then to disengage said hammer as a result of the depression of the rear end of said actuator-and-secondary-sear-member, a primary sear-abutment arranged to be actuated by the forward movement of said actuator-and-secondary-sear-memher to engage and disable said primary sear prior to the release of said hammer and a disconnector carried by said actuator-and-secondary-sear-member arranged to be cooperatively engaged by said breechblock following the discharge of said pistol to positively withdraw said primary sear-abutment from disabling engagement with said primary sear so as to permit said primary sear to cock said hammer, said actuator-and-secondary-sear-member being arranged also to be moved forwardly by engagement of said hammer with the thrust-abutment thereof when said hammer is moved into cocked 10 engagement with said primary sear to position said primary sear-abutment in cooperative relationship thereto, thereby to disengage said primary sear from said hammer on retraction of said trigger.

5. An automatic pistol of the blow-back type, including in combination; a frame having a camsurface; a breechblock reciprocably mounted on said frame; fire-control mechanism including a trigger mounted in the forward part of said frame, a hammer mounted in the rear part thereof, and a primary sear having a sear-shoulder; and double-action mechanism to connect said trigger and said hammer, said mechanism comprising an actuator-and-secondary-sear-member arranged to be moved forwardly by retraction of said trigger and having a cam-surface arranged to be moved into cooperative engagement with the cam-surface of said frame during the forward movement of said actuator-and-secondary-sear-member to depress the rear end thereof, a cocking-abutment at the rear end of said actuator-and-secondary-sear-member and a thrust-abutment forwardly thereof, said cocking-abutment being arranged normally to engage said hammer and sequentially to cook said hammer as a result of the forward movement of said actuator-and-secondary-sear-member by retraction of said trigger and then to disengage said hammer as a result of the depression of the rear end of said actuator-and-secondary-sear-member, a leaf-spring secured at its rear end to said actuator-and-secondary-sear-member and slidably engageable at its forward end with said frame to urge said cocking-abutment into reengagement with said hammer on release of said trigger, a primary sear-abutment arranged to be actuated by the forward movement of said actuator-and-secondary-sear-member to engage said sear-shoulder and disable said primary sear prior to the release of said hammer, and a disconnector carried by said actuator-and-secondary-sear-member arranged to be cooperatively engaged by said breechblock following the discharge of said pistol to positively withdraw said primary sear-abutment from disabling engagement with the sear-shoulder of said primary sear so as to permit said primary sear to cook said hammer, said actuator-and-secondary-searmember being arranged also to be moved forwardly by engagement 'of said hammer with the thrust-abutment thereof when said hammer is moved into cocked engagement with said primary sear to position said primary sear-abutment in cooperative relationship with said sear-shoulder, thereby to disengage said primary sear from said hammer on retraction of said trigger.

' GEORGE A. WILSON.

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Cited By (16)

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US2659994A (en) * 1950-02-03 1953-11-24 Marion W Yale Self-loading semiautomatic pistol
US2832266A (en) * 1952-11-08 1958-04-29 Sunderland Oswald Olds Automatic pistol
US3722358A (en) * 1971-01-14 1973-03-27 L Seecamp Combined single and double action firing mechanisms for pistols and kits for converting single-action pistols
US4028836A (en) * 1975-04-17 1977-06-14 Carl Walther, Sportwaffenfabrik Cocking mechanism for hand firearms
JPS58500622A (en) * 1981-04-30 1983-04-21
US4589326A (en) * 1982-10-28 1986-05-20 Technica Entwicklungsgesellschaft Mbh & Co. Kg Self-loading pistol in the form of a mechanically locked recoil loader
US4706401A (en) * 1981-03-10 1987-11-17 Nielsen Bent A Trigger mechanism for a weapon
US5160796A (en) * 1991-10-07 1992-11-03 Martin Tuma Automatic small arm
EP0540778A1 (en) * 1991-11-08 1993-05-12 ITM INDUSTRIAL TECHNOLOGY & MACHINES AG Trigger mechanism for firearms
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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659994A (en) * 1950-02-03 1953-11-24 Marion W Yale Self-loading semiautomatic pistol
US2832266A (en) * 1952-11-08 1958-04-29 Sunderland Oswald Olds Automatic pistol
US3722358A (en) * 1971-01-14 1973-03-27 L Seecamp Combined single and double action firing mechanisms for pistols and kits for converting single-action pistols
US4028836A (en) * 1975-04-17 1977-06-14 Carl Walther, Sportwaffenfabrik Cocking mechanism for hand firearms
US4706401A (en) * 1981-03-10 1987-11-17 Nielsen Bent A Trigger mechanism for a weapon
US4539889A (en) * 1981-04-30 1985-09-10 Gaston Glock Automatic pistol with counteracting spring control mechanism
JPS58500622A (en) * 1981-04-30 1983-04-21
US4893546A (en) * 1981-04-30 1990-01-16 Gaston Glock Automatic pistol
JPH0575960B2 (en) * 1981-04-30 1993-10-21 Gaston Glock
US4589326A (en) * 1982-10-28 1986-05-20 Technica Entwicklungsgesellschaft Mbh & Co. Kg Self-loading pistol in the form of a mechanically locked recoil loader
US5160796A (en) * 1991-10-07 1992-11-03 Martin Tuma Automatic small arm
EP0540778A1 (en) * 1991-11-08 1993-05-12 ITM INDUSTRIAL TECHNOLOGY & MACHINES AG Trigger mechanism for firearms
US6000162A (en) * 1996-11-07 1999-12-14 Colt's Manufacturing Company, Inc. Compact pistol
US20050108914A1 (en) * 2003-02-12 2005-05-26 S.A.T. Swiss Arms Technology Ag Trigger mechanism for small firearms
US7051638B2 (en) * 2003-02-12 2006-05-30 S.A.T. Swiss Arms Technology Ag Trigger mechanism for small firearms
US20160363401A1 (en) * 2013-09-22 2016-12-15 Arthur J. Elftmann Drop In Trigger Assembly
US9863730B2 (en) * 2013-09-22 2018-01-09 Arthur J. Elftmann Drop in trigger assembly
US20160320154A1 (en) * 2013-12-23 2016-11-03 Heckler & Koch Gmbh Device for preventing the tensioning of a firing pin spring in the disarming of a hammerless self-loading pistol provided with a lock slide and a self-loading pistol with such a device
US9689635B2 (en) * 2013-12-23 2017-06-27 Heckler & Koch Gmbh Device for preventing the tensioning of a firing pin spring in the disarming of a hammerless self-loading pistol provided with a lock slide and a self-loading pistol with such a device
USD828895S1 (en) 2016-09-28 2018-09-18 WHG Properties, LLC Trigger mechanism
US20180135929A1 (en) * 2016-09-28 2018-05-17 WHG Properties, LLC Trigger mechanism for a firearm
US9927197B1 (en) * 2016-09-28 2018-03-27 WHG Properties, LLC Trigger mechanism for a firearm
USD868928S1 (en) 2016-09-28 2019-12-03 WHG Properties, LLC Trigger mechanism
US10337816B2 (en) * 2016-09-28 2019-07-02 WHG Properties, LLC Trigger mechanism for a firearm
USD868198S1 (en) 2016-09-28 2019-11-26 WHG Properties, LLC Trigger mechanism
USD872216S1 (en) 2016-09-28 2020-01-07 WHG Properties, LLC Trigger Mechanism
US10156410B1 (en) 2018-03-01 2018-12-18 WHG Properties, LLC Trigger mechanism for a firearm
US10514222B2 (en) 2018-03-01 2019-12-24 WHG Properties, LLC Trigger mechanism for a firearm

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